Portable typewriting machine



FIG. 1 is a front and right perspective view of a portable typewritingmachine showing my new design;

FIG. 2 is a rear and left perspective view thereof;

FIG. 3 is a front elevational view thereof; and

FIG. 4 is a left side elevational view thereof.

The ornamental design for a portable typewriting machine, substantially as shown and described. 